Two distinctive variational regions of radial particle concentration profiles in circulating fluidized bed risers
文献类型：期刊论文
| 作者 | Xu, GG; Sun, GG; Nomura, K; Li, JH; Kato, K |
| 刊名 | POWDER TECHNOLOGY
 |
| 出版日期 | 1999-01-04 |
| 卷号 | 101期号:1页码:91-100 |
| ISSN号 | 0032-5910 |
| 关键词 | circulating fluidized beds radial distribution hydrodynamics particle concentration modeling regime transition |
| 其他题名 | Powder Technol. |
| 中文摘要 | The radial profiles of particle concentration in circulating fluidized bed (CFB) risers experience actually a sequential variation as 'uniform (dense)-nonuniform-uniform (dilute), in response to the flow evolution from minimum fluidization to pneumatic transport. Through measuring the lateral distributions of solid concentration in the range epsilon(mf) similar to 1.0 of the cross-sectionally averaged voidage, it was found that the first variational stage, from dense uniform (minimum fluidization) to nonuniform, is completed via the rapid decrease of the particle concentration in the bed core, and the succeeding second stage, from nonuniform to dilute uniform (pneumatic transport), is implemented via the quick decrease of the particle concentration near the bed wall. Based on this observation, general correlations were proposed to predict the local voidages on the bed wall (specifically, at the point where the dimensionless radius is equal to 0.99) and at the bed center, which can be used for the entire spectrum of gas-solid fluidization regimes prevailing in CFB risers. Further analyses demonstrated that such two variational regions are related also to the regime transition and the lateral distribution features of the transient solid concentration fluctuations. (C) 1999 Elsevier Science S.A. All rights reserved. |
| 英文摘要 | The radial profiles of particle concentration in circulating fluidized bed (CFB) risers experience actually a sequential variation as 'uniform (dense)-nonuniform-uniform (dilute), in response to the flow evolution from minimum fluidization to pneumatic transport. Through measuring the lateral distributions of solid concentration in the range epsilon(mf) similar to 1.0 of the cross-sectionally averaged voidage, it was found that the first variational stage, from dense uniform (minimum fluidization) to nonuniform, is completed via the rapid decrease of the particle concentration in the bed core, and the succeeding second stage, from nonuniform to dilute uniform (pneumatic transport), is implemented via the quick decrease of the particle concentration near the bed wall. Based on this observation, general correlations were proposed to predict the local voidages on the bed wall (specifically, at the point where the dimensionless radius is equal to 0.99) and at the bed center, which can be used for the entire spectrum of gas-solid fluidization regimes prevailing in CFB risers. Further analyses demonstrated that such two variational regions are related also to the regime transition and the lateral distribution features of the transient solid concentration fluctuations. (C) 1999 Elsevier Science S.A. All rights reserved. |
| WOS标题词 | Science & Technology ; Technology |
| 类目[WOS] | Engineering, Chemical |
| 研究领域[WOS] | Engineering |
| 关键词[WOS] | HEAT-TRANSFER ; GAS ; FLOW ; TURBULENT ; PRESSURE ; FLUCTUATIONS ; BEHAVIOR ; REGIMES |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000077805500010 |
| 公开日期 | 2013-11-15 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/6099]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | 1.Gunma Univ, Dept Biol & Chem Engn, Kiryu, Gumma 376, Japan 2.Acad Sinica, Inst Chem Met, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, GG,Sun, GG,Nomura, K,et al. Two distinctive variational regions of radial particle concentration profiles in circulating fluidized bed risers[J]. POWDER TECHNOLOGY,1999,101(1):91-100. |
| APA | Xu, GG,Sun, GG,Nomura, K,Li, JH,&Kato, K.(1999).Two distinctive variational regions of radial particle concentration profiles in circulating fluidized bed risers.POWDER TECHNOLOGY,101(1),91-100. |
| MLA | Xu, GG,et al."Two distinctive variational regions of radial particle concentration profiles in circulating fluidized bed risers".POWDER TECHNOLOGY 101.1(1999):91-100. |
入库方式： OAI收割
来源：过程工程研究所
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